Who played Martin Riggs in 'Lethal Weapon'?

Who played Greg Focker in 'Meet the Parents'? Who played Oskar Schindler in 'Schindler's List'? In which film is Oskar Schindler a character? Who played Amon Göth in 'Schindler's List'? In which film is Martin Riggs a character? Who played Roger Murtaugh in 'Lethal Weapon'? Who played Dutch in 'Predator'? In which film is Dutch a character?